# The 29 largest companies in Jena

Tamtam tracks 29 companies headquartered in Jena. This list ranks all of them by number of employees on LinkedIn, led by ZEISS Medical Technology, Friedrich Schiller University Jena and ZEISS Microscopy. Their median headcount is 80. Half of them were founded in 1999 or later.

The companies in Jena are a mix of established institutions and specialized technology firms. Noteworthy among them are ZEISS Medical Technology, focusing on ophthalmology and dental treatment, and JENOPTIK, an innovative photonics company. The Friedrich Schiller University Jena and Universitätsklinikum Jena represent the city's strong academic and healthcare sectors. Analytik Jena specializes in analytical measurement technology, while dotSource SE develops digital products for marketing and sales.

A significant pattern in these companies is the prevalence of optics, medical technology, and research. Several companies, such as ZEISS Medical Technology, ZEISS Microscopy, and JENOPTIK, operate in the photonics and medical device industries. Additionally, the presence of multiple research institutes and universities highlights Jena's role as a center for scientific and technological development.

🇩🇪 Jena · 29 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [ZEISS Medical Technology](https://www.tamtam.ai/c/zeiss-medical-technology) (zeiss.com)<br>This company focuses on advancing medical technology with a special focus on ophthalmology, ophthalmic surgery, visualization systems, dental treatment, and gynecology | Medical Equipment Manufacturing | 🇩🇪 Jena | 4,883 | 2002 |
| 2 | [Friedrich Schiller University Jena](https://www.tamtam.ai/c/friedrich-schiller-university-jena) (uni-jena.de)<br>A historic university in Jena, Germany with a focus on optics, glass manufacture, biotechnology, and a range of technological areas | Higher Education | 🇩🇪 Jena | 2,902 | 1558 |
| 3 | [ZEISS Microscopy](https://www.tamtam.ai/c/zeiss-microscopy) (zeiss.com)<br>A leading manufacturer of microscopes offering light, electron/ion, optical sectioning, and X-ray microscopes for life sciences, materials research, and industry markets | Nanotechnology Research | 🇩🇪 Jena | 2,017 | 1846 |
| 4 | [JENOPTIK](https://www.tamtam.ai/c/jenoptik) (jenoptik.com)<br>Innovative photonics company creating solutions for various industries worldwide, emphasizing sustainability, diversity, and exploration of new technologies to make a difference | Appliances, Electrical, and Electronics Manufacturing | 🇩🇪 Jena | 1,815 | 1991 |
| 5 | [Universitätsklinikum Jena](https://www.tamtam.ai/c/universitatsklinikum-jena) (uniklinikum-jena.de)<br>A leading university hospital in Thuringia with over 200 years of history, providing medical care to patients, education to students, and research opportunities for scientists | Hospitals and Health Care | 🇩🇪 Jena | 1,369 | 1558 |
| 6 | [Analytik Jena](https://www.tamtam.ai/c/analytik-jena) (analytik-jena.com)<br>Global leader in analytical measurement technology for molecular biology, liquid handling, and automation Provides solutions for various industries with precision, reliability, and comprehensive service | Biotechnology Research | 🇩🇪 Jena | 531 | 1990 |
| 7 | [Ernst-Abbe-Hochschule Jena](https://www.tamtam.ai/c/ernst-abbe-hochschule-jena) (eah-jena.de)<br>In Jena, a diverse university offers practice-oriented education in technology, economics, social sciences, and health, promoting interdisciplinary collaboration | Higher Education | 🇩🇪 Jena | 436 | 1991 |
| 8 | [zollsoft GmbH](https://www.tamtam.ai/c/zollsoft-gmbh) (zollsoft.de)<br>An innovative family-owned company offering a rapid-growing Apple-based software for medical practices, with a focus on creativity, growth, and team collaboration | IT System Custom Software Development | 🇩🇪 Jena | 409 | 2011 |
| 9 | [dotSource SE](https://www.tamtam.ai/c/dotsource-se) (dotsource.de)<br>dotSource develops scalable digital products for marketing, sales, and services through strategy consulting, technology selection, and agile methodologies Trusted by top companies | IT Services and IT Consulting | 🇩🇪 Jena | 330 | 2006 |
| 10 | [Intershop Communications](https://www.tamtam.ai/c/intershop-communications) (intershop.com)<br>Provides cloud-based e-commerce platform enabling manufacturers and wholesalers to digitalize operations, enhance customer experience, and increase online revenue globally. | IT Services and IT Consulting | 🇩🇪 Jena | 282 | 1992 |
| 11 | [Vistec](https://www.tamtam.ai/c/vistec) (vistec-semi.com)<br>Specializing in advanced electron-beam lithography technology, the company supplies equipment for semiconductor applications, research, mask making, integrated optics, and emerging markets | Semiconductor Manufacturing | 🇩🇪 Jena | 218 | 2006 |
| 12 | [Leibniz Institute on Aging - Fritz Lipmann Institute (FLI)](https://www.tamtam.ai/c/leibniz-institute-on-aging-fritz-lipmann-institute-fli) (leibniz-fli.de)<br>A research institute in Jena focused on studying genetic and environmental factors influencing aging, aiming to discover therapies for age-related diseases | Research Services | 🇩🇪 Jena | 182 | 2004 |
| 13 | [Max Planck Institute for Biogeochemistry](https://www.tamtam.ai/c/max-planck-institute-for-biogeochemistry) (bgc-jena.mpg.de)<br>This company conducts research on global biogeochemical cycles to understand how living organisms interact with the environment and impact ecosystems and climate | Research Services | 🇩🇪 Jena | 167 | 1997 |
| 14 | [Jena-Optronik GmbH](https://www.tamtam.ai/c/jena-optronik-gmbh) (jena-optronik.de)<br>This company specializes in developing visionary technology for leading-edge space missions, focusing on satellite communication, navigation, Earth observation, and stabilizing spacecrafts | Aviation and Aerospace Component Manufacturing | 🇩🇪 Jena | 117 | 1991 |
| 15 | [ESET DACH](https://www.tamtam.ai/c/eset-dach) (eset.com)<br>A European IT security software manufacturer with headquarters in Bratislava and a German branch in Jena, offering comprehensive protection solutions globally | Software Development | 🇩🇪 Jena | 80 | 2013 |
| 16 | [rooom.com - your virtual experience platform](https://www.tamtam.ai/c/rooom-com-your-virtual-experience-platform) (rooom.com)<br>A global startup based in Germany offering a platform for creating, managing, and publishing interactive metaverse experiences in 3D, AR, and VR for various industries | IT Services and IT Consulting | 🇩🇪 Jena | 52 | 2016 |
| 17 | [Active Fiber Systems GmbH](https://www.tamtam.ai/c/active-fiber-systems-gmbh) (afs-jena.de)<br>A technological leader in high-power femtosecond laser systems, offering compact to complex solutions based on fiber amplifier technology for scientific and industrial applications | Machinery Manufacturing | 🇩🇪 Jena | 49 | 2009 |
| 18 | [ORISA Software GmbH](https://www.tamtam.ai/c/orisa-software-gmbh) (orisa.de)<br>It develops innovative configure price quote software for customized solutions in engineering, automobile, and automation industries, focusing on client needs. | Software Development | 🇩🇪 Jena | 33 | 1991 |
| 19 | [Sonnenklar.TV Reisebüro Jena](https://www.tamtam.ai/c/sonnenklar-tv-reiseburo-jena) (sonnenklartv-reisebuero.de)<br>A travel agency offering personalized and innovative travel experiences with expert advice, destination knowledge, and excellent service through new media | Travel Arrangements | 🇩🇪 Jena | 31 | 2008 |
| 20 | [Volksbank eG Gera • Jena • Rudolstadt](https://www.tamtam.ai/c/volksbank-eg-gera-jena-rudolstadt) (volksbank-vor-ort.de)<br>The company is a cooperative bank dedicated to its customers and members, focused on helping them achieve their goals | Banking | 🇩🇪 Jena | 30 | 1857 |
| 21 | [EQUIcon Software GmbH Jena](https://www.tamtam.ai/c/equicon-software-gmbh-jena) (equicon.de)<br>A software company founded in 1992, specializing in equipment control solutions for industry and logistics sectors, with a focus on sustainable growth and client collaboration | Software Development | 🇩🇪 Jena | 26 | 1992 |
| 22 | [Quantum Optics Jena GmbH](https://www.tamtam.ai/c/quantum-optics-jena-gmbh) (qo-jena.com)<br>Specializing in quantum technology, the company focuses on advanced photon sources and quantum optical systems for enhanced data security and information processing | Research Services | 🇩🇪 Jena | 26 | 2020 |
| 23 | [Kontinent Spedition GmbH](https://www.tamtam.ai/c/kontinent-spedition-gmbh) (kontinent-spedition.de)<br>Global transport logistics provider offering professional packaging, storage, and supply management services to clients worldwide | Transportation, Logistics, Supply Chain and Storage | 🇩🇪 Jena | 25 | 1992 |
| 24 | [Navimatix GmbH](https://www.tamtam.ai/c/navimatix-gmbh) (navimatix.de)<br>Innovative software development company focusing on IoT, cloud computing, mobile apps, and DevOps for various industries like automotive, healthcare, and more | Software Development | 🇩🇪 Jena | 25 | 2007 |
| 25 | [TAF mobile GmbH](https://www.tamtam.ai/c/taf-mobile-gmbh) (tafmobile.de)<br>A leading software service provider for public transport, specializing in digital ticketing and mobility platforms, serving various transportation companies and promoting sustainable transportation options | IT Services and IT Consulting | 🇩🇪 Jena | 20 | 2003 |
| 26 | [JustOn](https://www.tamtam.ai/c/juston) (juston.com)<br>A company specializing in automating financial processes on the Salesforce platform, offering electronic billing, payment, accounting solutions to support global firms | IT Services and IT Consulting | 🇩🇪 Jena | 18 | 2010 |
| 27 | [wunschlösung GmbH](https://www.tamtam.ai/c/wunschlosung-gmbh) (wunschloesung.com)<br>An interdisciplinary team creates tailor-made, scalable web applications for business customers using self-developed code generators to automate application development | Software Development | 🇩🇪 Jena | 14 | 2015 |
| 28 | [OptoNet e.V.](https://www.tamtam.ai/c/optonet-e-v) (optonet-jena.de)<br>Representing leading Photonics players in Jena, OptoNet creates a platform for communication, cooperation, talent promotion, and marketing to boost international visibility | Appliances, Electrical, and Electronics Manufacturing | 🇩🇪 Jena | 8 | 1999 |
| 29 | [DEWB AG](https://www.tamtam.ai/c/dewb-ag) (dewb.de)<br>Specializing in investing in digital finance solutions, helping drive innovation and growth in the financial technology industry through strategic investments and partnerships | Venture Capital and Private Equity Principals | 🇩🇪 Jena | 6 | 1872 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

## The same list elsewhere in Germany

- [The largest companies in Germany](https://www.tamtam.ai/l/largest-companies-germany) (15,224)
- [The largest companies in North Rhine-Westphalia](https://www.tamtam.ai/l/largest-companies-north-rhine-westphalia) (2,983)
- [The largest companies in Bavaria](https://www.tamtam.ai/l/largest-companies-bavaria) (2,885)
- [The largest companies in Baden-Württemberg](https://www.tamtam.ai/l/largest-companies-baden-wurttemberg) (2,192)
- [The largest companies in Hesse](https://www.tamtam.ai/l/largest-companies-hesse) (1,378)
- [The largest companies in Lower Saxony](https://www.tamtam.ai/l/largest-companies-lower-saxony) (861)
- [The largest companies in Rhineland-Palatinate](https://www.tamtam.ai/l/largest-companies-rhineland-palatinate) (430)
- [The largest companies in Schleswig-Holstein](https://www.tamtam.ai/l/largest-companies-schleswig-holstein) (320)
- [The largest companies in Saxony](https://www.tamtam.ai/l/largest-companies-saxony) (297)
- [The largest companies in Brandenburg](https://www.tamtam.ai/l/largest-companies-brandenburg) (136)
- [The largest companies in Berlin](https://www.tamtam.ai/l/largest-companies-berlin) (1,739)
- [The largest companies in Munich](https://www.tamtam.ai/l/largest-companies-munich) (1,116)
- [The largest companies in Hamburg](https://www.tamtam.ai/l/largest-companies-hamburg) (949)
- [The largest companies in Frankfurt](https://www.tamtam.ai/l/largest-companies-frankfurt) (540)
- [The largest companies in Cologne](https://www.tamtam.ai/l/largest-companies-cologne) (464)
- [The largest companies in Düsseldorf](https://www.tamtam.ai/l/largest-companies-dusseldorf) (347)
- [The largest companies in Stuttgart](https://www.tamtam.ai/l/largest-companies-stuttgart) (306)
- [The largest companies in Bremen](https://www.tamtam.ai/l/largest-companies-bremen) (201)
- [The largest companies in Hanover](https://www.tamtam.ai/l/largest-companies-hanover) (155)
- [The largest companies in Bonn](https://www.tamtam.ai/l/largest-companies-bonn) (147)
- [The largest companies in Nuremberg](https://www.tamtam.ai/l/largest-companies-nuremberg) (137)
- [The largest companies in Karlsruhe](https://www.tamtam.ai/l/largest-companies-karlsruhe) (131)
- [The largest companies in Essen](https://www.tamtam.ai/l/largest-companies-essen) (126)
- [The largest companies in Mannheim](https://www.tamtam.ai/l/largest-companies-mannheim) (122)

## The same list elsewhere

- [The largest companies in the world](https://www.tamtam.ai/l/largest-companies-in-the-world) (415,122)
- [The largest companies in Europe](https://www.tamtam.ai/l/largest-companies-in-europe) (213,553)

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Source: https://www.tamtam.ai/l/largest-companies-jena